This is an older Primus that I purchased about 2 years ago. It came with a non original later model Primus silent burner that dates to about 1926. The burner had suffered from under burn and was in bad shape but luckily it was recoverable. See this post about how I repaired it. https://classiccampstoves.com/threads/simple-jig-for-reshaping-a-silent-burner-skirt.25343/ . A new old stock brass outer cap was also fitted as well as a new jet. The fuel tank filler tube had a slow leak under it, probably from a knock nearby so I had to finely resolder right around the base of it. It has been fitted with new seals throughout including a copper seal at the base of the burner itself. A new leather washer was fitted behind the pump piston and a new old stock leather pump cup was also fitted.